单项选择题
Conversation 1 Questions 6 and 7 are based on the following conversation.
A．Teacher and student. B．Classmates. C．Mother and son. D．Boss and clerk.
A．Go to the concert. B．Eat out. C．Go climbing. D．Go shopping.
A．15 dollars. B．30 dollars. C．45 dollars. D．60 dollars.